def required.join
import bend-kit-regex@0.8.0.0/regex.bend as Regeximport Base
570def required.join(right: Maybe<&2, Node>, left: Maybe<&2, Node>, a: Node) -> Maybe<&2, Node>:
571 match right:
572 case Some{r}:
573 Some{NCat{a, r}}
574 case None{}:
575 left